((3-(4-Chlorophenyl)-4,5-dihydro-5-isoxazolyl)methyl)phosphonic acid (3-(4-Chlorophenyl)-2-isoxazolin-5-ylmethyl)phosphonic acid 125674-57-9 Phosphonic acid, ((3-(4-chlorophenyl)-4,5-dihydro-5-isoxazolyl)methyl)-